My husband has C-PTSD and is hyervigilant. I understand this, as I also have C-PTSD. I control my dysregulation much more easily, as I have had lots of good therapy. I try to have a lot of patience with him, as he did not start therapy until much later in life. He gets so frustrated and blames himself for everything. I try to remind him that he is reacting when his brain is dysregulated. He struggles.